# The population of a country decreased from 162 million to 157 million over the course of 20 years. What was the percentage decrease?

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• Anonymous
1 month ago

You've got to be kidding?  What grade are you in?  4?

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• Here's the formula for any percentage change problem:

(new - old) / old × 100%

Basically you figure out the amount of the change, divide it by the original amount then multiply it by 100% to make it a percentage.

Note: This works for an increase or a decrease. If it is an increase, the resulting number is positive. If it is a decrease, the resulting number is negative.

old = 162 (million)

new = 157 (million)

(162 - 157) / 162 × 100%

= -5 / 162 × 100%

≈ -0.030864 × 100%

≈ -3.0864%

We can round that to something reasonable, like 1 decimal place:

≈ -3.1%

So the percentage change is -3.1%.

That means the population *decreased* by 3.1%

Approximately a 3.1% decrease in population.

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• (157-162)(100)/162 = = -3.09%

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• The population of a country decreased from 162 million to 157 million

over the course of 20 years.

The percentage decrease was 3.086419753.

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